使用C语言和libsocket库编写爬虫程序

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netdb.h> #include <unistd.h> #include <netinet/in.h> #include <libcurl/cURL.h>

#define MAX_HOST_LENGTH 1024 #define MAX_PROXY_LENGTH 1024 #define MAX_URL_LENGTH 1024 #define MAX_PORT_LENGTH 5

int main() { int proxy_sockfd; struct sockaddr_in proxy_addr; char proxy_host[MAX_PROXY_LENGTH]; char proxy_port[MAX_PORT_LENGTH]; char url[MAX_URL_LENGTH]; char response[MAX_HOST_LENGTH]; int response_len; CURL *curl;

// Set up the proxy server address
inet_aton(proxy_host, &proxy_addr.sin_addr);
proxy_addr.sin_family = AF_INET;
proxy_addr.sin_port = htons(8000);

// Set up the video URL
strcpy(url, "");

// Initialize the CURL library
curl_global_init(CURL_GLOBAL_DEFAULT);

// Create a CURL handle
curl = curl_easy_init();

if (curl) {
    // Set the proxy server
    curl_easy_setopt(curl, CURLOPT_PROXY, proxy_host);
    curl_easy_setopt(curl, CURLOPT_PROXYPORT, proxy_port);

    // Set the target URL
    curl_easy_setopt(curl, CURLOPT_URL, url);

    // Set the response buffer
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, response);

    // Perform the request
    CURLcode res = curl_easy_perform(curl);

    // Check for errors
    if (res != CURLE_OK) {
        fprintf(stderr, "curl_easy_perform() failed: %s\n",
                curl_easy_strerror(res));
    }

    // Free the CURL handle and global library
    curl_easy_cleanup(curl);
    curl_global_cleanup();
}

return 0;

}

这是一个简单的C语言爬虫程序，使用libcurl库来发送HTTP请求，并使用指定的代理服务器来抓取视频。